GHK Cu is the compound your body made at 25 and quietly stopped making. Most people find it in overpriced serums. Few understand what it actually does, or what happens when you're not GHK Cu Peptide Therapy: The Definitive Clinical Guide to Gene Modulation, Protocols, and Efficacy Reducing Redness & Inflammation with GHK Cu Copper Peptides Vitali Skincare The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline